glsl: Convert piles of foreach_iter to the newer foreach_list macro.
foreach_iter and exec_list_iterators have been deprecated for some time now; we just hadn't ever bothered to convert code to the newer foreach_list and foreach_list_safe macros. In these cases, we aren't editing the list, so we can use foreach_list rather than foreach_list_safe. Signed-off-by: Kenneth Graunke <email@example.com> Reviewed-by: Matt Turner <firstname.lastname@example.org> Reviewed-by: Ian Romanick <email@example.com>
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